21021121012122 has 64 divisors (see below), whose sum is σ = 58240335283200. Its totient is φ = 5460031430640.

The previous prime is 21021121012037. The next prime is 21021121012123. The reversal of 21021121012122 is 22121012112012.

21021121012122 is a `hidden beast` number, since 210 + 211 + 210 + 12 + 1 + 22 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21021121012095 and 21021121012104.

It is not an unprimeable number, because it can be changed into a prime (21021121012123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2527788172 + ... + 2527796487.

It is an arithmetic number, because the mean of its divisors is an integer number (910005238800).

Almost surely, 2^{21021121012122} is an apocalyptic number.

21021121012122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21021121012122 is an abundant number, since it is smaller than the sum of its proper divisors (37219214271078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021121012122 is a wasteful number, since it uses less digits than its factorization.

21021121012122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5055584688 (or 5055584682 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 21021121012122 its reverse (22121012112012), we get a palindrome (43142133124134).

The spelling of 21021121012122 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-one million, twelve thousand, one hundred twenty-two".